package com.ahm.server.config.security;

import com.ahm.server.utils.JwtTokenUtil;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.security.core.userdetails.UserDetails;
import org.springframework.security.core.userdetails.UserDetailsService;
import org.springframework.security.web.authentication.WebAuthenticationDetailsSource;
import org.springframework.web.filter.OncePerRequestFilter;

import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

public class JwtAuthenticationTokenFilter extends OncePerRequestFilter {
    @Autowired
    private UserDetailsService userDetailsService;
    @Autowired
    private JwtTokenUtil jwtTokenUtil;
    @Value("${jwt.tokenHeader}")
    private String tokenHeader;
    @Value("${jwt.tokenHead}")
    private String tokenHead;
@Override
protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain chain) throws ServletException, IOException {
    String authHeader = request.getHeader(this.tokenHeader);
    //存在token
    if (null != authHeader && authHeader.startsWith(this.tokenHead)) {
        String authToken = authHeader.substring(this.tokenHead.length());
        String username = jwtTokenUtil.getUserNameFormToken(authToken);
        //token中存在用户名但未登录
        if (null!=username&& null== SecurityContextHolder.getContext().getAuthentication()){
            //登录
            UserDetails userDetails = this.userDetailsService.loadUserByUsername(username);
            //验证token是否有效，重新设置用户对象
            if (jwtTokenUtil.validateToken(authToken,userDetails)){
                UsernamePasswordAuthenticationToken authentication = new UsernamePasswordAuthenticationToken(userDetails, null, userDetails.getAuthorities());
                authentication.setDetails(new WebAuthenticationDetailsSource().buildDetails(request));
                SecurityContextHolder.getContext().setAuthentication(authentication);
             }
         }
    }
    chain.doFilter(request,response);
}
}